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	While this isn't explicitly mentioned in the specification, there is a WPT test that checks for this behavior.
		
			
				
	
	
		
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			29 lines
		
	
	
	
		
			1.1 KiB
		
	
	
	
		
			Text
		
	
	
	
	
	
#import <CSS/CSSRule.idl>
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#import <CSS/CSSRuleList.idl>
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#import <CSS/MediaList.idl>
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#import <CSS/StyleSheet.idl>
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// https://drafts.csswg.org/cssom/#cssstylesheet
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[Exposed=Window]
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interface CSSStyleSheet : StyleSheet {
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    constructor(optional CSSStyleSheetInit options = {});
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    readonly attribute CSSRule? ownerRule;
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    [SameObject] readonly attribute CSSRuleList cssRules;
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    unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
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    undefined deleteRule(unsigned long index);
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    Promise<CSSStyleSheet> replace(USVString text);
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    undefined replaceSync(USVString text);
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    // https://drafts.csswg.org/cssom/#legacy-css-style-sheet-members
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    [SameObject, ImplementedAs=css_rules] readonly attribute CSSRuleList rules;
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    long addRule(optional DOMString selector = "undefined", optional DOMString style = "undefined", optional unsigned long index);
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    undefined removeRule(optional unsigned long index);
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};
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dictionary CSSStyleSheetInit {
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    DOMString baseURL = null;
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    (MediaList or DOMString) media = "";
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    boolean disabled = false;
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};
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